Polypropylene films employing recycled commercially used polypropylene based films and labels
a polypropylene film and commercially used technology, applied in the direction of identification means, instruments, seals, etc., can solve the problems of biaxial oriented polypropylene film coated with chlorine-containing polymer, copolymer generally are (is) quite expensive to recycle, etc., to achieve enhanced sustainability life cycle and reduce material cost
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example 1
b 3 Layer Coextrusion
[0029] In a representative embodiment of this invention, a three layer opaque film was produced by a typical biaxial orientation tenter process, which is well known. This example includes a core layer comprising 68%, by weight, of a mini random copolymer of polypropylene including 0.6% ethylene; 22%, by weight, of a batch formulation including 62.5% calcium carbonate, 29.4% polypropylene homopolymer and 7.5% titanium dioxide and 10%, by weight, of printed, recycled labels collected as scrap from a label printing and lamination process. This OPP film based label scrap was formed into extruded pellets that were introduced into the barrel of the extruder employed to form the core layer of this example. The recycled pellets also contain 3% ML 1803 manufactured by ML Plastics, which is utilized as a process aid for effective extrusion of printed labels into extruded pellets.
[0030] A description of the recycled label extrusion process is detailed as Example 5.
[0031...
line example 3
Two Ply Lamination
[0040] In another representative embodiment of this invention, film from Example 1 was used to produce a two film component lamination structure in combination with AET's 400 WHSL three layer OPP coextruded film. In this example, film from Example 1 was laminated to the non print / non white side of the 400 WHSL film to produce a two film component lamination structure. In this example, one of the outer coextruded layers consists of white pigmented formulations from Example 1 and one white layer is from the 400 WHSL film. The 400 WHSL film is designated as being laminated to the “IN” side of the lamination structure.
[0041] AET's 400 WHSL film is a three layer coextruded film with a voided core and a white pigmented print skin. This product is approximately 125 gauge thick, has a yield of 40,000 in2 / lb, a density of 0.55, a Tappi opacity of 84 and a whiteness index of 86.
[0042] The lamination step is carried out by employing any suitable adhesive, such as an acryli...
example 4
Three Ply Lamination
[0043] In another representative embodiment of this invention, a film from Example 1 was used to produce a three film component lamination structure with two of AET's 400 WHSL three layer OPP coextruded films. In this Example, 400 WHSL was laminated to each side of Example 1 to produce a three film component lamination structure. In this example, both outer coextruded layers consist of white pigmented formulations from the 400 WHSL film. The lamination step is carried out by employing any suitable adhesive, such as an acrylic-based adhesive; such adhesives being well known to those skilled in the art. Thus, in the above-described laminated structure the outer skin layers both include 10% titanium dioxide as the whitening agent to mask the otherwise gray appearance that would be imparted to the film by the recycled label stock.
Table of Lamination data for Examples 3 & 4Example 3Example 4Thickness (approximate gauge)420540Yield (in2 / lb)10,6808,155Density (gm / cc)...
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Abstract
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